Sierra Marine engine parts are designed to meet or exceed the OEM part they are intended to replace and theyare backed by the SeaStar Solutions Two-Year Warranty—one of the best in the business.We offer a variety of O-rings, oil seals and seal kits for most engine applications on the water today—including MerCruiser, OMC, Johnson/Evinrude, Volvo and more.How to find the O-ring you needMany of the O-rings we offer fit multiple applications. Notice in the list below that in addition toJohnson/Evinrude and OMC applications, there are a variety of other engine applications for the O-rings offeredhere. O-rings can also be selected by inside diameter and width, which also appear in the table.The Sierra Engine Parts SelectorIf you do not see the O-ring (or other engine part) you need, please visit the Sierra Engine Parts Selector,where you can search by engine make, model, serial number or year of manufacture. Sierra #ManufacturerOEM Part #I.D.WidthQty.Model18-7141-9Johnson/Evinrude Outboard3211170.180"0.065"51051908018-7141- 9GLM800800.180"0.065"51051908018-7141 -9OMC Stern Drive3211170.180"0.065"51051908018-7141- 9Volo Penta38521650.180"0.065"51051908018-7178- 9Johnson/Evinrude Outboard3201400.920"0.135"51051935318-7178- 9GLM821300.920"0.135"51051935318-7178 -9Mallory9- 765550.920"0.135"51051935318-7178-9OMC Stern Drive3201400.920"0.135"51051935318-7178- 9Volo